Patent US2770443A successfully refreshed from Google Patents.
US2770443A
Expired / Lapsed
US
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Multiple seal valve
Assignee: MAGIC SEAL Inc
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Filing: 1949-02-12
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Granted: 1956-11-13
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Expires: 1969-02-12
Abstract
No abstract record available.
Inventors
- 👤 Henry J Rand
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:52
CPC Classifications
F; F16; F16K; F16K1/00; F16K1/32; F16K1/34; F16K1/36; F16K1/38
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1406748A
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US1577539A
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FR615121A
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US2148850A
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US1919232A
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US1968965A
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US2219324A
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US2240129A
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US2299068A
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US2311748A
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US2489623A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-11-13 | 1960-05-14 | 1960-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-11-13 | 1964-05-14 | 1964-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-11-13 | 1968-05-14 | 1968-11-13 | $7700.00 | Window Closed / Lapsed |